uncaught exception: Syntax error, unrecognized expression: #

uncaught exception: Syntax error, unrecognized expression: #

I am using jQuery 1.4.2 and jQueryUI 1.7.2 on http://www.kimburda.com/Paul-Bakaus

However, I keep getting "uncaught exception: Syntax error, unrecognized expression: #" error when I try to drag and drop content widgets.

Please advise, thanks.